Machine for forming lug straps



C. H. PEIRSON ET AL MACHINE FOR FORMING LUG STRAPS May 15, 1923. 1,455,554

Filed Auz. 28.' 1922 2 Sheets-Sheet l May 15, 1923. 1,455,654

C. H. PEIRSON ET AL MACHINE FOR FORMING LUG STRAPS ,Filed M192. 28, 1922 2 .Sl'xeelZS-SheefI 2 Patented May 15, 1923.

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ASSIGNORS T0 E. F. HOUG-HTOIII' t C0., 0F

PORATION OF PENNSYLVANIA.

PHLADELPHZ-l, PENNSYLVANA, A COR- IMACHINE FOR FORMING LUG STRAPS.

Application filed August 28, 1922. Serial No. 584,701.

T0 all whom t may 'concern Be it known that We, CHARLES H. PumsoN and YWILLIAM A. Berlina, citizens of the United States, and residents of Philadelphia, Pennsylvania, have invented certain Improvements in Machines for Forming Lug Straps, of which the following is a specification.

rlhe object of our invention is to construct a. machine for bending and forming lug straps of leather, or equivalent material.

Lug straps are used to connect the lug stick of a loom with the picker stick and are made of a series of strips of leather held together by glue, or other ceinentitious material.

In the accompanying drawings:

Fig. 1 is a view in elevation of our improved machine for forming lug straps;

' Fig. 2 is a side View of the machine;

Fig. 3 is a vertical, sectional View;

Fig. 4 is a sectional plan view on the line Fig. 5 is a sectional plan View on the line 55, Fig. 3; l

Whg. 6 is a sectional plan view on the line 6-(5, Fig. 3;

Fig.4 7 is a perspective View of one of thewedges; y

' F ig. 8 is aperspective View of a lug strap formed by our improved machine; and

Fig. 9 isa sectional view of the lug strap.

Referring to the drawings, 1 is the back plate of the machine mounted on a channel member 1a. 2 is the inside former for the lug strap, which is attached to a block 4 by bolts 3. The former 2 rests against the back plate 1 and the block extends through a slot 5 in the plate, as shown in Fig. 3. 5a is an abutment at the upper end of the slot 5 and the block fl is held against this abutment by a spring 6 secured to the block and to a pin on the channel member.

Mounted in bearings at the upper end of the back plate is a shaft 8 on which is a cam 7 having a handle 9. The cam rests against the upper end of the former 2. When the cam is turned, it forces the former 2 towards a fixed block 10 secured to the back plate and clamps a leather blank onto the block. rThe Lipper end 11 of the block 10 is curved to form the rounded end of the lug strap, and the lower end 12 of the former 2 is curved to produce a curved surface on the inside of the lug strap, as shown in Fig. 9.

The block 1() is held in a fixed position by bolts 101, which entend through a slot in the plate l.

18' is a cylinder secured to the back plate.' ln this cylinder is a plunger 17 having a piston 17a. The plunger isattached to a cross head 16, which is arranged to slide on the back plate. In the present instance, the cross head has two arms 15, which slide on the back plate l. rlhe back plate has lon- .gitudinal slots 1b. Extending through these slots are flanged guide strips 15, which are secured to the arms by screw bolts, or other fastenings. rlhe arms are connected by up? per and lower clips 16a. Secured to the upper clip 16 is a Wear plate lltvvhich rests on the fixed block 10.

13, 13 are Wedges, which are located on the inside of each arm 15. rlhe inner surface ofeach arm is beveled, asshown in F 1. Secured to each Wedge is a stud 19, which passes through a slot 2O in its arm. On this stud is a spring 21 bearing against the outer surface of the arm and a nut on the stud and tending to hold the `Wedge yieldingly to the arm. Secured to each stud is a coiled spring 22, which is attached to a pin 23 on an arm. The tendency of the spring 22 is to hold the Wedges yieldingly in the forward position. rhe plunger may be operated by air, Water, or othervfluid, under pressure. llhen fluid under pressure is admitted to the cylinder'by the pipe 18, the cross head-With its armsis raised, and When the fluid is admitted to the cylinder by the pipe 18h, at the upper end of the cylinder, the plunger is retracted, At the upper end of the machine are stops 2li in the forni of screws, which limit the movement of the wedges 13.

ln operating the machine, the leather blank to be bent is made of a series of strips of leather held together by glue, or other cementitious material, in order to produce blanks of the proper thickness. rEhe blank is then introduced into the machine before the glue, or other ceinentitious material, sets. lt is then placed on the block 10 and the former 2` is moved towards the block by operating the handled cam 7. The cam causes the former 2 to clamp the blank firmly onto the blank 10, which gives the blank the proper contour.` The plunger 17 is raised, which causes the wedges l13 to turn the projecting ends oll the strap/against thel'sides or" the former- 2. l/Vhe'n the wedges strike the screw stops 24:, they remain in a lfixed position -While the l' plunger', and its arms, continue the forward movement. This movement forces the wedges towards the formery 2 and the wedges firmly clamp the strap against the sides of the former. The

parts;- :reinain in this `position until Vthe cef mentitio'us; materialfsets, .after which the blank be retracted and the inished lug strap removed from the machine.

By using the Wedges, the ends oi they lug strapslare not subjected toi-great pressure untiltlie wedges are driven in contact with thelstopwscrgews. rlhis prevents chafinglyand tearing loit the leather.

lVeCflaii'nv:` 4 M1., fliege n'ibination in a machine for" fo'riiiing lug straps, or" `a back plate; vav block thereon; aniovabl@J former; means for mov- I thelformer to clamp a blank against the cylinder; aplunger `mounted in rthe cylinder; across headon the plunger; and afri'i'isxon the crosshead extending on each sideoif` the` block and yarranged to bend the blank'arou'nd the former as the plunger is raised., v i l combinationin a machine 'for formingglug straps, `of fa back plate; a, ix'ed block thereon; ainovable former for clampiifigt blank totliefblockf; across :head having a'rm'sneiitending lon eachside ol .the block;

aryvedlge; between leach armr and the block;

and means 'forinoving thecross head'.y

'3. The combination in ya vn'iachine for fornilin'gliigg'lstraps, of@ back plategja block thereonya sliding i'forrner mounted on the plate; spring. tending to hold the urinerl 'awayro'm thefbl'oclr;` a cam for @faire they ,forma towards. the 'blo-'Ck to clainptlieblank thereon; a cylinder on the back plate;- a plunger in the cylinder; a

' 'gross head k:on the, plunger; arms on the u lcross vhead extending on each side of the blockthe inner surfacesof the arms being beveled; a wedge resting against the beveled surface of each arm; andmeans for holding the wedges yieldingly against their arms, the

arms, with their "wedges, bending blk against the former .when the plfger is raised. i l Y i 4. The combination` in a machine for forming lug straps, of aback plate; a block thereon; a sliding former mounted on the back plate; a cam'for forcing the former towards the block to clam'pa blankthereon avcylinder on the lback plate; a plunger in said cylinder; a cross head on they plunger;

two arms extending fromfthe vcross head, the inner surface of eacharm beingbeveled; a wedgeresting against the beveledsurf'ace of Yeach arm; means 'for holdingthe wedges yieldingly against the arms; and meansor holding the wedgesy yieldingly, in I thefforward'k position sothat, when. theplfungefr is raised, the arms' will carry the wedges pastl the block, bending the blanlrqand clamping the same against the former.

5. The combination in a machinedior forming lug straps, ola basel; plate; alixed block thereon; a movable 'former mounted i.

arm5vva spring onthe stud,l yieldingly hold# ing the wedge Lagainst"the"arm; Ia spring tf tached` to eachstud and to the arm tending to lioldthe wedges in the lorwa'dposition; and adjustable ystops to liinit'the movement raised independently of the wedges order to torce the wedgesftowards'the former, p

oiiannns' HL. garrison! WILLIAM A. vBOI-IUE. y 

